GPT-5.1-Codex-Max
OpenAI · released Dec 4, 2025
- Type
- Proprietary
- Input
- $1.25
- Output
- $10.00
- Cached
- $0.13
List price · per 1M tokens · OpenAI at 400K context · source ↗
Our take
Written Aug 3, 2026GPT-5.1-Codex-Max is a proprietary coding model from OpenAI that can handle up to 400,000 tokens in a single request and accepts both text and images. It is built for analysing entire codebases at once, though its premium output rate and lack of measured quality data make it a trust-based purchase.
Pick this when you need to throw an entire repository into one prompt for analysis or refactoring, or when you want to turn screenshots, diagrams or UI mockups into working code. Skip it if you are price-sensitive, need verified quality scores to justify cost, or want to run the model on your own hardware.
The case for it
- Among the longest request limits we track for any coding model, at 400,000 tokens — enough for most entire repositories in one go.
- Accepts image input, so screenshots and diagrams can feed directly into code-generation workflows.
The case against it
- Premium output rate with no measured quality data in our records to justify the cost.
- Throughput is only measured for one provider; the rest list no speed figure.
How good is it?
We hold no score for this model.
We look for every model we track on every board we watch, and none of them has turned up GPT-5.1-Codex-Max — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.
Or rent it from someone else
Why this differs from the header. The strip above quotes OpenAI's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $1.25 in / $10.00 out
- Context served
- 400K
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouter | $1.25 / $10.00 | 400K | not measured | Unknown | Unknown | Unknown |
| Microsoft Azure AI | $1.25 / $10.00 | 400K | 80 tok/s | No | No | Confirmed |
| OpenAI | $1.25 / $10.00 | 400K | not measured | No | Yesunknown period | Unknown |
| OpenAIpriority tier | $2.50 / $20.00 | 400K | not measured | No | Yesunknown period | Unknown |
Microsoft Azure AIAcross the 4 listings we hold: 3 say they do not train on prompts, 0 say they do and 1 do not say. 1 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouter | ✓ | ✓ | ✓ |
| Microsoft Azure AI | ✓ | ✓ | ✓ |
| OpenAI | ✓ | ✓ | ✓ |
| OpenAIpriority | ✓ | ✓ | ✓ |
Tool calling: 4 of 4 listings say yes. JSON output: 4 of 4 listings say yes. Strict schema: 4 of 4 listings say yes.
When we formed this view
Dates behind this page
Prices last checked 9d ago
What we do not know about this model yet
- No board we watch has turned up a score, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 4 listings do not say whether they train on prompts.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.
Identifiers
- Modality record
- text+image->text
- Catalogue slug
- openai-gpt-5-1-codex-max